Recently I came across a website of language proficiency for French, I think this is a good idea for people to know their language level; in addition, it can assist in one's language learning especially after one is aware of where he/she is and for.

By self-assessment, I mean it can stimulate people to move on before one is qualified/ prepared for any official test/ accreditation test. It's handy and economic.

Is there any such website for English? And other languages?
Thanks in advance.